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AD9956时钟选择

		
	
				

			

									
					    xs@92
					
							


			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Mar 16, 2017 
				
			
			
		
    
		
		                     
				
        		
    
		    
		    		    
		    			
    
			    
    请问AD9956如果选择直接用外部晶振时钟，对晶振的频率有要求吗？一定要400M，还是只要不超过400M就可以，比如20M。谢谢！